Quick answer
A budget calculator totals your income and spending by category and shows what is left. On take-home pay of $6,200 a month with $4,900 of expenses and $800 saved, the leftover is $500 — and the savings rate is 12.9%, the single number that decides how fast your finances improve.
How the Budget Calculator works, step by step
Enter your monthly take-home pay, then your spending across nine categories: housing, transport, food, utilities, insurance, entertainment, dining, subscriptions and other. Use bank and card statements for a real month rather than estimating — most people underestimate food and discretionary spending by a wide margin, and a budget built on guesses fails in the first week.
The calculator sums the categories and subtracts them, plus your savings, from income. The leftover is unallocated money: positive means the plan funds itself, negative means the budget is funded by borrowing, and the shortfall amount is the size of the problem to fix. The savings rate — savings divided by income — is shown alongside, because it predicts progress better than any single category.
Work through the output in order: the largest categories first. Housing and transport are usually 40% to 55% of spending between them, so a 10% cut there beats eliminating small subscriptions many times over. In the worked example, housing alone is $1,850 — 29.8% of take-home pay — so a $185 housing saving is worth more than every subscription combined. A common planning target is a 15% to 20% savings rate including any employer match; below 10%, retirement at a conventional age usually requires a long career or a high income.
Treat savings as a line item, not a residual. Enter the amount you intend to save and let the leftover absorb the pressure; then set that amount to move automatically on payday, or it will be spent. Automating the transfer matters more than the amount: a $600 transfer that happens on payday beats an $800 intention that depends on willpower at month-end, because the leftover is spent by default and saved only by design.
Two cases need a different setup. Irregular expenses — insurance premiums, annual subscriptions, holidays, car maintenance — should be converted to a monthly amount and saved in advance (a sinking fund): add up a full year of them and divide by 12. If your income varies, budget fixed costs against your lowest typical month and hold one to two months of expenses as a buffer that smooths the good months into the lean ones.
The formula
Leftover = Total monthly income − total monthly expenses − savings. Savings rate = savings ÷ income × 100.
Worked example — try it on the calculator above
Worked example: $6,200 take-home pay
Monthly spending: housing $1,850, utilities $320, food $780, transport $540, insurance $460, entertainment $200, dining $300, subscriptions $80, other $370. The categories total $4,900. Add $800 of planned savings and the total outflow is $5,700, leaving $500 unallocated — a cushion for the month something breaks, not money to spend. The savings rate is $800 ÷ $6,200 = 12.9%, or $9,600 a year directed to an emergency fund, investing or extra debt payments.
Frequently Asked Questions
What savings rate should I aim for?
A common planning target is 15% to 20% of gross income directed to retirement and savings combined, including any employer match. Below 10%, retirement at a conventional age usually requires a long career or a high income. The right rate depends on when you start: starting at 25 needs far less per month than starting at 45.
Should I budget on gross or take-home pay?
Take-home pay — the amount that actually reaches your account. Gross pay includes taxes and payroll deductions you never control. Budgeting on gross overstates your capacity by 20% to 30% for most employees, which is why the calculator asks for take-home pay.
How do I budget for irregular expenses like car repairs?
Convert them to a monthly amount and save it in advance (a sinking fund). Insurance premiums, annual subscriptions, holidays and car maintenance are predictable in total even if the timing is not. Add up a full year of them and divide by 12.
What if my income varies month to month?
Budget fixed costs against your lowest typical month, not your average. Save the surplus in good months to a buffer account and pay yourself a steady amount from it. Freelancers commonly hold one to two months of expenses as this buffer.
Estimates, not advice. This calculator provides educational estimates based on the inputs you enter and the assumptions shown on this page. It is not financial, tax or investment advice, and it cannot see your full situation. Verify important figures against official sources, and consider a qualified professional for decisions about your own money. See our Disclaimer and Methodology.